Parts for your 2015 Toyota Mark x-Thrust bearing

2015 Toyota Mark X thrust bearing — what it is and how to look after it

Drawing on Toyota GR‑series engine repair manuals for the 4GR‑FSE (2.5‑litre) and 2GR‑FSE (3.5‑litre) fitted to the 2015 Mark X — which specify a crankshaft thrust bearing at the No. 3 main journal to control end float — and Aisin documentation for the A760E/A761E automatic transmission (torque‑converter equipped, no clutch release/“throwout” bearing), this model does use a thrust bearing. It’s an engine component, not a gearbox item on the standard 2015 Mark X.

The thrust bearing’s job is to keep the crankshaft from shuffling fore and aft under axial loads. Those loads come from the torque converter pushing on the crank, accessory belt forces, and driveline events. Keeping end float within spec protects the block and crank thrust surfaces, stabilises timing and oil pump alignment, helps maintain smooth idle and shift quality, and reduces the risk of rear main seal issues. In short, it’s a small part that quietly preserves the big, silky character the Mark X is loved for.

It’s not a routine service replacement, but it should be checked any time the bottom end is open or when end‑float concerns pop up. Sensible care helps: keep engine oil fresh and at the correct level, ensure the cooling system and PCV are healthy, and avoid repeated high‑stall “brake‑torque” launches that load the converter against the crank. If the vehicle is one of the rare 2015 GRMN manual cars, good clutch habits further reduce axial shock, but the mainstream automatic models don’t use a clutch release bearing.

When investigation is needed, a workshop will measure crankshaft end float with a dial indicator and compare to the Toyota spec in the repair manual. If it’s out, the fix is to replace the main bearing set with the correct thrust halves, inspect and, if necessary, polish or grind the crank’s thrust faces, then re‑measure. It’s a professional job, typically paired with a rear main seal and fresh sump sealant. Quality bearings, correct cap torque/sequence, and assembly lube are must‑dos. Catching wear early prevents collateral damage and keeps the GR V6 running smoothly for the long haul.

• Tell‑tales to watch for: noticeable in‑out movement at the crank pulley, repeat rear main seal leaks, fine metallic in oil, or a clunk when loading/unloading the drivetrain.

FAQs

Does a 2015 Toyota Mark X have a thrust bearing?
Yes — per Toyota’s GR‑series engine manuals, the 4GR‑FSE and 2GR‑FSE engines use a crankshaft thrust bearing at the No. 3 main journal. The common Aisin A760E/A761E automatic doesn’t use a clutch release (throwout) bearing, as it’s torque‑converter based.

When should the thrust bearing be replaced?
It isn’t a scheduled service item. It’s replaced during an engine rebuild or if crank end float measures out of spec. A technician will check end float with the sump off, if excessive, the main bearings (with thrust halves) are renewed and the crank thrust faces inspected.

What symptoms point to thrust bearing wear on a Mark X?
Signs include discernible fore‑aft crank pulley movement, recurring rear main seal leaks, metallic glitter in used oil, or drivetrain clunk when loading/unloading. Proper diagnosis involves measuring end float against the Toyota specification.